Which of the following is a verbal version of the

ankarskogC

ankarskogC

Answered question

2021-10-14

Which of the following is a verbal version of the Product Law (assuming the limits exist)?
(a) The product of two functions has a limit.
(b) The limit of the products the product of the limits.
(c) The product of a limitis a product of functions.
(d) A limit produces a product of functions.

Answer & Explanation

Tuthornt

Tuthornt

Skilled2021-10-15Added 107 answers

Step1
To Determine: which of the following is a verbal version of the product law
Given:we have two functions f and g
Explanation: the option b is correct that is the limit of the product is the product
proof: let we have two functions f and g such that
limxaf(x)=l and limxag(x)=m
to prove:limxa(fg)(x)=lm
let >0 be given
now
|(fg)(x)lm|=|f(x)g(x)lg(x)+lg(x)lm||f(x)g(x)lg(x)|+|lg(x)lm|
=g(x)|f(x)l|+|l||g(x)m|
Step 2
since limxag(x)=m, therefore g(x) is bounded in some deleted neighbourhood of x=a
hence there exist k>0 and δ1>0 such that |g(x)|k whenever 0<|xa|<δ1
limxaf(x)=l and limxag(x)=m
therefore, corresponding to any given >0, we can find positive number δ2 and δ3 such that
|f(x)l|<2κ whenever 0<|xa|<δ2

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